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From: Scott Wood <swood@redhat.com>
Date: Sat, 27 Jul 2019 00:56:32 -0500
Subject: [PATCH] sched: __set_cpus_allowed_ptr: Check cpus_mask, not
cpus_ptr
This function is concerned with the long-term cpu mask, not the
transitory mask the task might have while migrate disabled. Before
this patch, if a task was migrate disabled at the time
__set_cpus_allowed_ptr() was called, and the new mask happened to be
equal to the cpu that the task was running on, then the mask update
would be lost.
Signed-off-by: Scott Wood <swood@redhat.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
kernel/sched/core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1126,7 +1126,7 @@ static int __set_cpus_allowed_ptr(struct
goto out;
}
- if (cpumask_equal(p->cpus_ptr, new_mask))
+ if (cpumask_equal(&p->cpus_mask, new_mask))
goto out;
if (!cpumask_intersects(new_mask, cpu_valid_mask)) {
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